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Is this first error highlighting the 'n' or the quotation marks? If the quote marks have come from Word, you need to replace them.
The second error is probably because you're missing a closing tag somewhere.

ErrorLine 56 column 268:
non SGML character number 148.
the right “measurements” as well

It means exactly what is says. You have an invalid character code in your markup (code point 148, which is within the range reserved for C1 control characters). You've probably copied and pasted from some Microsoft application that uses Microsoft's non-standard encoding cp-1252, or a DOS encoding (like cp-850). (In cp-850, 148 is 'ö'; in cp-1252 it's the typographically correct right double quotation mark: ”.)